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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e30f9bdfd7d6eeb0d55b8f9989cf5813ded6f4827ee5a6d772c123dba33437' 
  AND token = 'tf0szcK1GeLehaVsPgG9S087tHkxJBACgTN9r/bp1cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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