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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54a6b02485e9e66bbbfce0fff212b24776c4501b296cf2155957c4f7f430f83' 
  AND token = 'Ha4xT7cspAc7Gwr6sl4U894M82Bs82y697HTquyLeJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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