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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee958d9f0e479c74a10ae9545c0e5d1895e3108a408be3853f0d99e944034df4' 
  AND token = 'HA6uzUfqEKIHda0/dgo+w8e57XGdEtVUdISIjMnj2iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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