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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3a48187f11fa570cdd3febe311737628b41cee4f4663b15341f583dd82b82d' 
  AND token = 'PKUtjfRFebYLPFfMS+0QJ3Fd2aNGsQECzXiSHpM6qjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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