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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6009e9052ae228b4133f4b0ee642bd3d82d573d1d19852779ec96b5eda5e3ea3' 
  AND token = '56/7R9TDWxPdxjz7wHhGHj9ZIC6CYFNkwcVJN5Xn1wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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