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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2fe0f28e56fcff3a15688fff5b75ae112d576265ccfda9d9e50be497e2048f' 
  AND token = 'Wsys5Nw6qQsL4lup5wZEGerJ3JItIOXI0tSU6nypKWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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