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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e27540b4a96898c4fcf82a42f5570bfef6ece8ab3aee9891886dd6d1bf4673' 
  AND token = 'Ri9k4K3S7WSo0C7QEcHuqcWuh+oYBgs1NXygf/exGq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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