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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5e4feed14babd61b517ee861c48904a53596e6b3ec49da4efa34ba5c99589e' 
  AND token = '6bh3EhKhTJta8wQGoHPF8ejUsp9+5jrMRkJF+kvrYBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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