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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e8920f192fe87e3c22c2ee61f42d64ce055dfc9a49c53f451a4317e54e4ed5' 
  AND token = 'ucqP4Ic0k+5H5JT+6GAUp5jl9rs8IMobJbY8V0cw5Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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