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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1105ab089583ae94faa11beee5671ceb904d37d9c04b9b7e091f4f7d4e2c953' 
  AND token = 'UGZgmYO15jP9GC69Ca5+Ba511b/zq4ZlqGc/M1evAeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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