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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848fb9d02ac3b1ec13f7e34c5c21ad9026bf1b5a69a52643bda5b09fb2bd8474' 
  AND token = 'engFcpRi3djSxkDSo8EvoWmjE4qBUUWg7pM8gfDhkE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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