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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d04a2f9b1d212f27297461807f91af1d0be8c1c344b91edf23103fac64f574' 
  AND token = 'UfS8FXqFjvHva9d3aUb8VYiD96/sqxWxBZOPYHSv+1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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