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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9dcf69bd9e5f6d492eac2dd13cd8589d8b42c231bafd2af4e2f85aae1e6950e' 
  AND token = 'VOMNVd0CnFsZ7r5wzRWjKb5gqQbRDQNyWu/8LAWpLA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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