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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1388ccdf872bef9c323f7a61b1e52123d621166b5a0fd4d5d803d2752bc4f669' 
  AND token = 'NRkRISAUrLRide09bzkycLHfQUErTnSnpHFoPCqthVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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