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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11fd6cf5a332ea2857d36dca73b6b8ae8da3977d1e4d2ece81e8df9e5ad5309' 
  AND token = '4e2UZEdPLECu+gsQv3gprFeD/6Ud4Von6Do9iZq25cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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