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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bc6a17c47d0a56345d0397de0ca51a8b9643f1ccd3116589ce7a7b7b72d0cd' 
  AND token = '2u+kzJPD0FCh09z3U4t0C+oZYMSv+qG94+o/FqYGtpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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