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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6dcdf249b35389742ebebc8b8ec25bf0848a3bbdbdbb880d87ae8bc740873bf' 
  AND token = 'hmuGoT0Rc3zgfVM7jUKU+e2si5TMs8VX1cbI7eW7lR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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