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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca6c1428578c9655e975d59bb4f4a2e61376d2057df5bdf04f2fdf0e53ec4e2' 
  AND token = 'l14OutN4mv17PMg/MHesVgY6AZfPp0h4Ib+FB5I2PAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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