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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aceee510ec11b6d711c82f120bbbe82af2194c3a822a6bb1b6f92d5236b1a7cc' 
  AND token = 'F7vjWx/uorUnV78OFxr4QFyTToel7EvslEqEDMgKMas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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