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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fadbe450eba41be42b0d6bb009c4bbfb2d219d11d8c40c24aa5cc750a101fd' 
  AND token = 'cP1+lTIfAtHMJqq0IftrLNfWnPuChIaa4spZ8OD4Kng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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