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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05c5ce43c0fac350b9c681abb1629a4193f5209d61341e17cf32524969402aa' 
  AND token = 'pVwq5A8gqW+9lyzbuUuaWaA6zwe992cdebrhb/Ds+eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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