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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f6a8f5d6db797ce8f19351a1ffcc3e4371a4c60722076a68fbdedf63e78257' 
  AND token = 'Etpba3uCmS95+/6Pcb5zc2T/3+4/ejpD74JAiFXf3qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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