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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '781c1caab840f4cd647f715cf1dd49197ce3b74429e0a9a7cad1c0c91c549517' 
  AND token = 'iiXwZmD2cRIhbq1Vo2tN58ibi87Al4CKD4hOIkgQufI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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