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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadd2598b5e38f83d68a75b596ed81260cb274b942be10a936dcddcdfc9ac09a' 
  AND token = '3q+T8xSb/zwmubIKBDuaZzw6SkkGUkHf4Dca2cjjiJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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