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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9d2721f214c91f0176a03cde79fe1780bd86ee33aa69ba7dda27291c2c9848' 
  AND token = 'n06rYRPUlnVPDwY236PwE0zpm7D20INUC6ZoQpn3NcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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