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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e247539df5668d77cbb2bda908a0e42efe485e615e0c0b3db1f09b599b93ff' 
  AND token = 'XjjkcNIOMhguXakfq6NOPj3LyvQF8kWfYiQCG90nfTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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