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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39706700ae4a250c8b1696351ce41fabb4d551dd0b26b73ae60e5483d3c60d0' 
  AND token = 'of/byFXG0FEZ5U3R9s858rjYxKwSgbeUGgEy/nGrvdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}