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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a99e0d9e922ec69dfbe6d7b64bff794ca4c5d63171260c413c5c75f374b00d1' 
  AND token = 'e4BeUYSTc0/cc6//7u6QotZ4y6bSN/1Tx8tIBssp1Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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