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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964e1309a95b8afae164394d060738a367a6f5d775aa368367e1bbe4808707cc' 
  AND token = 'M5dYBpfcJAOKUvs/B1XG0Ra4C8Cd5FN9GIbB5LXZq2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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