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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48a2cf3ba8321fb88b3ba61fe97e940b7ffab0f863573dbbded433bba351c14' 
  AND token = '0DYYBJCsG3TrsQBJi2GnhOejv93rhIgoHmng3mfnhV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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