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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94517193d0884b49af4d51e8ce8ab166dc69e08074b05aec5f7b716a7e819be' 
  AND token = 'hgzphxfLcsp0tiTEe4bxWeA2akfahOF+j4faonCSdcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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