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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db950f69239ab1ddeb47691dfe4da3e4146754edaf5c90295390cd770eb9ffab' 
  AND token = 'w94OD4lD3CCWxmLVMiR0WrTAm/hHUfzf3LlpMRtnrj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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