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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96da10ecccd10de3556fa880101e5d837d3443d35dcb12029d82f7d88bebb10' 
  AND token = 'ivCmIPP+krxtNUCGGAFXWkd08IubxzDV6zr4owUfgtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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