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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095e56241fad8394535dcd2c82443dd057325c30df9d50776e3a472c1eb72e8a' 
  AND token = '/VJ6RyDdJ7I4Jjm5AcHfNnX3v+llOWkEMZsd0WF1eOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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