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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256988771b869b2f4caea120984a7823430596cee997afa68d6e4802736f0cd5' 
  AND token = 'Uw2+81kb4foyivfaWe7GCtFM0hELFYXcX9YR7OXR9AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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