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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc40448cf81ac3a87a864df071e140024bd85e7050d9fe2e22017f2603cec3a' 
  AND token = 'UYHu5cuBC1EXVlxNGA2HSy83IkgiNAcjesqusM2UF9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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