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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabe70d68aeb4cd322887b02bee1d734d31eab839d21a7f2b04a7d80912186d8' 
  AND token = 'QCilqcbTuEOOytTNQwt7HBgrtOnAbMEknyHVwx4QfNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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