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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9525ef986b197b783c7aa0dc20b93d98acd9e86919f1d1985862c60b73defb' 
  AND token = 'fSK0qG9PrxW1XwPQcBBEgVBd8FFzBm6eKHFg2n0eW80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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