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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fe82bee3b2ff0c1a860243665154c7d0b5d33f5965cd56690d3e7fff5c2ddc' 
  AND token = 'UePbeFk1vFnGRZGsoOojfV25s4MvB3XvGnBG2VtU04k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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