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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3446dd82ab2a3eb881cb1eeaa4fd706b917b1b558d78199b76983f4a4f3b6d' 
  AND token = '0uPmHhzVf2j5mgewBji+Qw2nxym93lfXOO2yt3r0AHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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