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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f882376e5de25bd20d86af62d8f40911621bcf8caf5c4bd23e63621b3245037' 
  AND token = 'L7t53sJOZOiCOWYWRLl7w5YpLzI5GuxenrI7G0haKdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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