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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a95ac46eb4271dee0861e018a2098d4495bffeee3255b7a34bef9b38fbb217' 
  AND token = '1fcO0E71HF97ODnW+5rvmfO+Rm04dpV7iDkTZn/P1UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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