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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccd245fbd955f73e12afdd90ff022a20c806765a9a193349c2bc4eda2ee3ef1' 
  AND token = 'ambb1Pck1Qj+UleI4ADUG7nv6J47nWIVdK80vKYfjnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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