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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98411917f9f6d2b84c43dd91075c88b12205430400c03114d3416128c16bd3ef' 
  AND token = 'XD0GhY0CB72wpERRSm2A7Fh0VZkdkE58Yhm1pf8qkNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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