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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a054430550db5a3fcb7a14b65dafd069ae8003e8359d2c5c3c45cae06404550f' 
  AND token = 'dK6+xXJIm3VzBqFc/udyR2ERhYdWZky74dMk4oOuuhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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