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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f6a095b6f25e9c68918efae3e4f5d374a2eca561c8d5144e243d23df9e62fd' 
  AND token = 'yfS/Qf5FU+joCPGL5uQTXX8a7J5wZx6sbLWttRaLNJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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