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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40f31358ba02c11df6fdce58c324bec701681c384870918fc11dfd2a92eff0b' 
  AND token = 'SBN54nZVJ12r4H2LQQ1aRuuWx4hAbA9Zhv1WO8oMrgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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