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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf552edbc81db4a5aadc2d25b056dc34034285367d2c1f9d65ebc6f249b0015' 
  AND token = 'h7gn0jQjP7FVx09wcCB3LXqyuid5WB8Rog9eOTqsdB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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