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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787910d071bcc8898c6b0ae7ead3e64952b382231b4cae131ba86b6796b74ce6' 
  AND token = 'bTrQBL4+1MMvfzWmn+ovbcUaO5v1elM/ieyW1fzSscI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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