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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634f75b84a710350e7d9b316d1093618de802c972644bccc1b60c56773162bcb' 
  AND token = '5vquT4rpMkB2PIwFxDMB2KE0mC0JkXeOtFp4tGT47V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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