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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3880c1db76e6a7a4c9b362a102a68afccf773ea4bb7a7a5d68ecdd30f1b4c33' 
  AND token = 'h6U8a9OjBRP+z2SgNYMU+ekzivc89CcqLddZXv45OyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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