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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f7f12a0595da480482470f7eecfde77441799f43580462bcf8117fa123a222' 
  AND token = '5/IAVU5ua6g8etqh6sfQvp9Sy4XGfS/TwgONmIhtRIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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