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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d90ee17666cc181ebfb4a99bd757a3af2d0bf5617c2a24f6448ed0dfa38453' 
  AND token = 'I9B/0LIggVSm4VJ1qfliicuri56N6YdVUM5ZrPgD9kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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